Arthur/Olivia

• D.W. as Olivia
• Arthur as Ian
• Pal as Perry
• Nemo as Edwin
• Baby Kate as William (Genderbend)
• Jane as Olivia's Mother
• David as Olivia's Father
• Grandma Thora as Olivia's Grandma
• Buster as Julian
• Francine as Francine (Same name)
• Brain as Harold
• Emily as Alexandra
• Muffy as Daisy
• George as Sam
• Timmy Tibble as Oscar
• Tommy Tibble as Otto
• Miss Morgan as Mrs. Hogganmuller